Far Cry 3’s standalone “expansion pack”, Far Cry 3: Blood Dragon, has passed 500,000 sales in the two months following its April release.

In an interview with GamesIndustry International (via Eurogamer), Ubisoft’s CEO Yves Guillemot said he was “very happy” with Blood Dragon’s sales, and that it’s given the company the opportunity to look at other “brand extensions.”

Released digitally on Xbox 360, PlayStation 3 and PC, the game is a retro science fiction-themed take on Ubisoft’s open-world shooter, Far Cry 3.